Sold me a faulty iphone5s

I took my faulty iphone to the store for repairs on 7/03/15 and did not get any communication as to how long it would take, I visisted the store to find out where the phone is and only then I was infromed that it was sent to the iStore, its been a month already and no feedback, I called several times and the staff is *********** and could not even provide me with a turn around time as to when I would recieve the phone. I was provided with a contact number that I can not get through to,which says \we are currently busy with walk in client".... so the existing clients is not important.This service is pethetic and I am paying for a phone that is not in my possesion. Telkom and keep their broken phone and I want to cancel my contract. """